Not sure if this is the exact study that you're referring to, but the two-volume study, Aptitude for Destruction, from RAND published last year is definitely worth the read:
Organizational Learning in Terrorist Groups and Its Implications for Combating Terrorism
Case Studies of Organizational Learning in Five Terrorist Groups
(Note: The 5 case studies are of Aum Shinrikyo, Hezballah, Jema'ah Islamiyya, PIRA and ELF/ALF)
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